Cabal revisions of unamb-0.2.7

Hackage metadata revisions edit the .cabal file after upload; each diff below is one revision.

 Name:                unamb Version:             0.2.7+x-revision: 1 Cabal-Version:       >= 1.6 Synopsis:            Unambiguous choice Category:            Concurrency, Data, Other Library   hs-Source-Dirs:      src   Extensions:-  Build-Depends:       base >= 4 && < 5+  Build-Depends:       base >= 4.6 && < 5  --                     , tag-bits >= 0.1.1 && < 0.2